What is L10 bearing life?

L10 is the number of million revolutions (or hours at a given speed) that 90% of a group of identical bearings will complete before showing fatigue failure. 10% will fail earlier.

What is the dynamic load rating C?

C is the constant radial load that gives an L10 life of one million revolutions. It is published in bearing catalogs and depends on bearing size, type, and number of rolling elements.

How do combined radial and axial loads affect bearing life?

Combined loads are converted to an equivalent dynamic load P = XVF_r + YF_a. The X and Y factors depend on the bearing type and the ratio F_a/F_r, found in bearing manufacturer tables.

Bearing L10 Life Calculator

Calculate bearing L10 life: L_10 = (C/P)^p × 10⁶ revolutions. Exponent p = 3 for ball bearings, 10/3 for roller. Compute equivalent dynamic load P = X×V×F_r + Y×F_a.

2D stress state at a point. All stresses in MPa.

σx — Normal Stress X (MPa)

σy — Normal Stress Y (MPa)

τxy — Shear Stress (MPa)

⚙ Mechanical Note: Results are based on standard textbook formulas and ISO/AASHTO references. Always verify critical designs with applicable codes (ISO 898, AASHTO 1993, AISC, Eurocode 3) and a qualified engineer.

How to Use

Enter the values for the patient or scenario you are assessing. Calculate bearing L10 life: L_10 = (C/P)^p × 10⁶ revolutions. Exponent p = 3 for ball bearings, 10/3 for roller. Compute equivalent dynamic load P = X×V×F_r + Y×F_a. Use the bearing l10 life result to inform your clinical assessment.

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